A Phoenix man is charged with killing his wife and son out of fear that he gave his lover HIV after he had sex with prostitutes.

The Associated Press reported that 64-year-old Eugene Maraventano used a 14-inch knife to kill his wife Janet Maraventano and 27-year-old son, Bryan at their home in Goodyear, Arizona.

According to police, Eugene believed his wife was sick and thought she would test positive for cancer or a disease he had given her from sleeping around with random women when he worked for a rail line in New York.

After murdering his wife while she was sleeping, Eugene then killed his son when he knocked on the bedroom door. The police report indicated that Eugene said Bryan didn't have a girlfriend and he thought he was disabled because he couldn't get a job. Eugene concluded that his son was incapable of making a living on his own.

Investigators noted that Eugene said he made several unsuccessful suicide attempts and called police Saturday to report that he killed his family days later.

Eugene admitted that he and his wife hadn't been fighting the night of the killing, but confessed to getting a 14-inch knife and going into the upstairs master bedroom. The knife was found on the night stand in the bedroom.

One of the Eugene's neighbors told CBS 5 News that the killings were tragic.

I don't think he's the man he wanted to be. Until he confessed it I didn't want to believe it. There is not one inkling of 'I saw this coming.' There is none of that with Gino," the neighbor said.